abstract: Recently, a theory of stochastic integration for processes with values in a UMD Banach space has been constructed in joint work with van Neerven and Weis. In this talk an Ito formula is presented, which is applied to obtain regularity in space and time for strong solutions of a class of stochastic evolution equations. This extends results of Da Prato-Tubaro-Iannelli and Brzezniak